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A Treatise Describing the Construction, and Explaining the Use of New Celestial and Terrestrial Globes
A Treatise Describing the Construction and Explaining the Use of New Celestial and Terrestrial Globes Author:George Adams Subtitle: Designed to Illustrate, ... the Phoenomena of the Earth and Heavens, ... by George Adams, ... General Books publication date: 2009 Original publication date: 1777 Original Publisher: printed for and sold by the author Subjects: Science / Life Sciences / Biochemistry Science / Life Sciences / Biology / Molecular Biology Notes: T... more »his is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: The greateft refradUon is when the planet, i5cc. is feen in the horizon, being 33 mm. When its altitude is 20 deg. the refraction i$ 2 m. 14 fee : at 40 deg. of altitude it is 58 fee : at 60 deg. of altitude it is 29 fee. and fo becomes infenf1ble, as the altitude increafes. Solar and lunar eclipfes, 80. An eclipfe is a deficiency of light in the heavenly bodies. In an eclipfe of the fun, its light is intercepted from the fight of the inhabitants of any part of the earth, by the moon paffing between them and the fun ; and as its difc is either partly, or wholly covered, it is called a partial or total eclipfe. An eclipfe of the moon is caufed by her paffing through the fhadow of the earth, whereby fhe is deprived of the fun's light. The fun can never be eclipfed but at the time of New Moon ; neither can there be an eclipfe of the moon, but at the time of the Full Moon : In the firft cafe, the New Moon muft be within 18 degrees, in the Jaft, the Full Moon within 12 degrees, of pne of her nodes. Thefc 1-. . . 1 . . Thefe luminaries are not eclipfed every New and Full Moon, becaufe the moon's motion is not in the plane of the ecliptic, in which the fun and earth always are. Hence the moon's latitude is oftentimes fo much increafed at the time of the New Moon, that her fhadow does not touch the earth; and at the time of Full Moon, fhe as fre...« less